Phil, many of us make adapters. I use Corian, drill a 1/4" hole in it and then turn it down to where it fits through the tube of the kit. Obviously you would need two for the El Grande. I like corian as it is more stable. If you use scrap wood, drill a 7mm hole and glue in a slimline tube prior to turning. Both of these will fint on the 7mm shaft of your kit and end mill the larger kits. BTW, label your adapters! [8D]